Production of effects on mixed goods composed of cotton and wool.



UNITED STATES PATENT OFFICE.

PHILIP GUTHLAC JONES, OF MANCHESTER, ENGLAND, ASSIGKOR TO FARBENFABRIKEN VORM. FBIEDR. BAYER 6c 00., OF ELBERFELD, GERMANY, A CORPORATION OF GER- MANY.

PRODUCTION OF EFFECTS ON MIXED GO'UDS COMPOSED OF COTTON AND WOOL.

Specification of Letters Patent.

Patented Feb. 9, 1909.

Application filed May 14, 1908. Serial No. 432,955.

To all whom it may concern:

Be it known that l, PHILIP GUTHLAG Jonas, citizen of the Kingdom of Great Britain, residing at Lu anchestcr, Kingdom of Great Britain, have invented new and useful Improvements in the Production of Effects on Mixed Goods Composed of (lotton and Wool, of which the following is a specification.

in the United States Letters Patent 873,613 dated December 10th 1907 there is described that by treatment of wool with chromium compounds its allinity for sulfur colors is considerably reduced. 1 have found that the resistance of wool to sulfur compounds is increased, if instead of a treatment with chromium compounds alone wool is subjected to a treatment with formic aldehyde and chromium compounds and it loses after such treatment almost completely its ailinity for sfilfur colors.

On dyeing with sulfur colors mixed fabrics consisting of cotton and wool in which the wool has been treated as above mentioned, the wool will remain practically white and it may be dyed afterwards with suitable coloring matters. The wool may be d *ed and treated as above mentioned be ore s inning or weaving with cotton. Cottonc 0th with white or colored woolen threads e. g. a cotton cloth with white or colored edges or lists can thus be obtained.

For the dyeing with sulfur colors it is advisable, to employ a method which does not impair the strength of the animal fiber. For this pur osc the process of dyeing may be used w vich is described in German Letters Patent 173685 and according to which the mixed goods are dyed in a dyebath containing the sulfur dye, sodium sulrid andsalts of organic acids possessing a reducing action 0. g. formic acid, lactic acid, or the like. If such a dyebath is em ploycd for the dyeing of mixed goods, the woolen fiber contained therein is not injured and the lactic acid etc. in the dyebath adds to the power of the formaldehyde and the chromium compound which these substances exert in protectin the woolen fiber against being dyed by su fur colors.

White effects can be obtained e. g. by using wool treated with formic aldehyde and chromium compounds as.listyarn for cotton piecagoods and dyeing the mixed above stated. Mixed colored goods as effects can be obtained by dyein wool treating it with formic aldehyde an chromium compounds alter dyeing, weaving or spinning the dyed wool with cotton arn and finally dyeing the goods with sulfurcolors; or the white wool after treatment with formic aldehyde and chromium compounds is interwoven, the fabric dyed with sulfur-dyes and the wool is then dyed with suitable dyestuffs.

In carrying out the process more practically I can proceed as follows: The wool is treated at about 60 C. in a. bath containing one per cent. of formic aldehyde and 0.15 per cent. of potassium bichromate. It is then either spun or interwoven with cotton. The fabric is then dyed in a dyebath charged per one liter with 8 grams of Katigen black TW extra, 8 grams of crystallized sodium sulfid, 5 grams of calcined soda, 30 grams of common salt, 26 cubic centimeters of the acid sodium salt of lactic acid. The goods are entered at 2025 C. and dyed for from 1 to 1%; hours at this temperature, rinsed in water and then in adilute acetic acid solution.

Instead of treating the wool fabric as mentioned by itself, it can be treated after having been spun or interwoven with cotton. In both cases black cotton cloth with white effects is obtained.

Instead of bichromate of potassium other suitable chromium compounds, e. g. chr0- mium fluorid may be used. The treatment with chromium compounds and with formaldehyde can alsobe done in two different operations. Of course other sulfur coloring matters can be used.

To obtain mixed colored clfects the wool is treated with formic aldehyde and the chromium compounds either before or after being dyed with suitable coloring matters, e. g. anthracene yellow C, acid anthraccne red 3B, bcnzo fast red FC, brilliant wool blue B extra, alkali fast green 3G extra. The dyeing and treatment with formaldehyde and chromium compounds may be done either before the spinning or weaving with cotton or after; but in the latter case it must take place before the dyeing with the sulfur coloring-mat'ters. If however the wool has been treated with formaldehyde and ,chromium compounds the mixed fabrics can be dyed first with sulfur coloring-matters and after wards with suitable wool dyes. Variegated effects can be obtained on using wool dyed in different colors.

taken to select only such dyestuffs, which are not affected by the chemicals necessary for dyeing the cotton.

I do not confine myself to the particulars given in the above example which are merely typical and can be varied within wide limits without altering thereby the nature of my invention.

Having now described my invention and in what manner the same is to be performed, I declare that what I claim is l. The process of producing variegated colored effects on fabrics composed of cotton and wool, which consists in treating the wool with formaldehyde and suitable chromium compounds and then dyeing the fabric with If the dyeing of the wool precedes that of the cotton care must be sulfur dyes, the wool resisting the action thereof and remaining uncolored, substantially as described.

2. The process of producing variegated colored effects on fabrics composed of cotton and wool, which consistsin treating the wool with formaldehyde and suitable chromium compounds and then dyeing the fabric with sulfur dyes,- the wool resisting the action thereof and remaining uncoloi ed, and then dyeing the fabric with any of the colors ordinarily employed for wool dyeing, sub stantially as described.

In,testimony whereof I have hereunto set I my hand in the presence of two subscribing witnesses.

PHILIP GUTHLAC JONES.

Witnesses Jorrn WILLIAM THOMAS, MALCOLM Smmuunsr. 

